1.
A broken exhaust system:
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does not cause problems.
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can let poisonous carbon monoxide to leak into the cab.
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can improve fuel efficiency.
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poses no threat to the driver.
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2.
You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
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you won't receive a CDL.
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you'll need to take another knowledge test about air brakes.
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you'll have to immediately retake your test using another vehicle.
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you will be restricted to driving vehicles without air brakes.
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3.
If air pressure does not build up fast enough:
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you may be forced to turn off the engine and release the parking brake.
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you should put the parking brake on and gently pull against it in a low gear.
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you should turn the electrical power on and step on and off the brake pedal.
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the pressure may drop too low during driving.
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4.
To use the controlled braking method in an emergency, you should:
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pump the brake pedal 3 times.
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apply your brakes all the way, and release the brakes when the wheels lock up.
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apply the brakes as hard as you can without locking the wheels.
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apply the brakes when the wheels lock up.
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5.
With brake drums, if brakes become too hot:
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your ABS will malfunction.
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the brakes may stop working.
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the brakes will supply too much power to the drive wheels.
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the air compressor will kick on to cool the brakes.
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6.
In a dual air brake system, if one air system is very low on pressure:
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you should pump the brakes to restore pressure.
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the effect won't be noticeable for the first 50 miles.
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you should drive and brake as you always have.
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either the front or rear brakes will not be operating fully.
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7.
With a fully-charged air system, the leakage rates should be less than:
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2 psi for single vehicles and 3 psi for a combination of two vehicles.
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5 psi for single vehicles and 10 psi for a combination of two vehicles.
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5 psi for single vehicles and 4 psi for a combination of two vehicles.
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3 psi for single vehicles and 4 psi for a combination of two vehicles.
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8.
The tractor protection valve:
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will close automatically if the air pressure drops to a certain level.
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provides the air supply for the brake system.
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will close if you apply the parking brakes.
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All of the above.
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9.
Emergency brakes are:
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not required on doubles.
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not required on commercial vehicles with air brakes.
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not required on buses.
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required on all vehicles.
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10.
If an aggressive driver is involved in an accident down the road, you should:
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make eye contact with the driver.
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try to get their vehicle to the side of the road.
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confront the aggressive driver.
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stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
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